Here is a list of all files with brief descriptions:

[detail level 123]

docs
src
diagnostic
diagnostic_bspline.hpp	Mode-resolved B-spline field and moment diagnostics
moments.hpp	Gyrokinetic and drift-kinetic velocity-moment accumulation
solver
bspline.hpp	Solver-facing one-dimensional B-spline basis and quadrature
bsplines_basis.hpp	Tensor-product B-spline basis metadata for the field solver
fftw3.hpp	Solver-local FFTW plans, buffers, and transform operations
fourier_filter.hpp	Fourier filter for field-aligned modes
gyropoints.hpp	Solver gyro-point generation and finite-Larmor-radius quadrature
interface_solver_in_orb5.hpp	ORB5X-to-field-solver lifecycle and data interface
math_util.hpp	Solver indexing, integration, and small linear-algebra utilities
profiles_wrapper.hpp	Solver adapter for ORB5X equilibrium and species profiles
solver_boundary_conditions.hpp	Radial boundary conditions for field matrices/RHS
solver_data.hpp	Distributed field-matrix storage, assembly, and factorization
solver_mpi.hpp	MPI distribution and backsolve of Fourier-mode field systems
spclibs
bsplines.hpp	B-spline types and operations for spclibs C++ port
matrix.hpp	Matrix types and operations for spclibs C++ port
pppack.hpp	Low-level B-spline routines from PPPACK
antenna.hpp	Configurable electrostatic/electromagnetic antenna forcing
background.hpp	Background distribution and equilibrium-flow helpers
collisions.hpp	Langevin collision operators and conservative moment correction
comisland.hpp	Shared Kokkos storage for magnetic-island fields and derivatives
control_all.hpp	Top-level run lifecycle, configuration, and HDF5 orchestration
diagnostics.hpp	Simulation diagnostics, reductions, spectra, and HDF5 output
efluid.hpp	Reduced electron-fluid response coupled to kinetic ions and fields
epilogue.hpp	Normal/abnormal termination and completion checks
equil.hpp	Magnetic equilibrium, coordinates, metric, and profile evaluation
fft_wrapper.hpp	FFTW-backed grid/Fourier transforms
fields.hpp	Field storage, B-spline coefficients, deposition, and solves
globals.hpp	Process-wide normalized configuration and subsystem state
gyrodensity_correct.hpp	Finite-Larmor-radius gyro-density correction
interpos.hpp	One-dimensional smoothing interpolation for source/profile data
island.hpp	Prescribed magnetic-island perturbation construction and evaluation
larmor.hpp	Larmor-ring geometry and finite-Larmor-radius sampling
mass_matrix.hpp	Assembly and application of B-spline mass matrices
matrix_coeff.hpp	Physical coefficient assembly for field-equation matrices
onestep.hpp	One operator-split ORB5X simulation timestep
parmove.hpp	MPI marker migration across toroidal spatial subdomains
part.hpp	Marker storage, loading, gyrokinetic push, deposition, and I/O
part_fields.hpp	Particle-facing field gather and gyroaverage operations
pdespline.hpp	Spline projection and PDE helper operations
pputil.hpp	MPI initialization, topology, reductions, and timing utilities
prec_const.hpp	Scalar types, constants, dimensions, and model selectors
profile_update.hpp	Time-dependent relaxation of background profiles
profiler.hpp	Lightweight named-region execution profiling
pszs.hpp	Phase-space zonal-structure diagnostics and filtering
quadtree.hpp	Adaptive phase-space quadtree for noise control
random_coll.hpp	Collision-specific random streams and sampling
random_generator.hpp	Pseudo/quasi-random sequences for marker algorithms
readinput.hpp	ORB5-compatible input parsing, defaults, and validation
sorting.hpp	Marker binning and permutation for locality and load balance
sources.hpp	Heating, Krook/buffer, coarse-graining, and noise-control operators
util.hpp	Interpolation, root finding, fitting, and small I/O utilities
vis3d.hpp	Distributed 3-D mesh sampling and PIXIE/XDMF HDF5 output